print_string "code 'x' = ";;
print_int (Char.code 'x');;
print_newline ();;

print_string "escaped '\\n' = ";;
print_string (Char.escaped '\n');;
print_newline ();;

print_string "lowercase 'G' = ";;
print_char (Char.lowercase 'G');;
print_newline ();;

print_string "compare 'a' 'b' = ";;
print_int (Char.compare 'a' 'b');;
print_newline ();;
